Improvement in boring-machines



UNITED STATES PATENT OFFICE.

JOSEPH EDGECOMB, `OF IVORCESTER, MASSACHUSETTS.

IMPROVEMENT IN BORING-MACHINES.

t Specification forming part of Letters Patent No. 34,137, dated January 14, 1862.

To all whom t may concern:

Be it known that I, JOSEPH EDGECOMB, of the city and county of Vorcester, in the State of Massachusetts, have invented certain new and useful Improvements in Automatic Boring-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings forming a part of this specification, in which- Figure l represents a plan or top View of the machine when the stand or adjustable frame is in a Vertical position. Fig. 2 represents a front View looking in the direction of arrow l; and Fig. 3 represents a section on line A B, l, showing more fully the mechanism for operating and elevating the auger, bit, or other instrument or tool used in the operation of boring.

In the accompanying drawings, A represents the base-piece usually employed in such machines, having a portion B cut out to permit of the free descent of the cutting or boring tool or instrument, whatever may be its inclination.

O C are ear-pieces, (one of which is shown separately in Fig. 4,) fastened to the rear of the base-piece A by bolts or screws a a, and between the front lower corners of which is hinged or pivoted the lower end of the adjustable stand or frame D, while in the curved slots or openings b work guide screws or bolts c c, the inner ends screwing into projections CZ d of the part- D, and by means of which the part D can be turned forward and inclined from a vertical position and there held by means of said screws or bolts c c, as is well understood by those conversant with this class of machines.

The frame D is of a peculiar construction and is made of metal, being cast in one piece. Its form resembles a half-circle, the rear lower part being a little flaring, while the center is left open, as seen at E. The rear or back of the frame is also provided or cast with holes or openings to make it lighter. The front edges of the frame D are provided with flanges d d, as seen in Fig. 5, which is a crosssection on line :c fr, Fig. 2, and upon which slides or works the hooked edges e e of the gear-frame F, as indicated in section, Fig. 5. To avoid unnecessary friction, frame F clasps the anges d d only at its four corners, an

open space being left on each side between the corners, as seen at f f, Fig. 6, when frame F is cast.

The cross-pieces of frame F swell out in front, while from the lower one a hub or bearing-piece g projects down, as shown in the drawings, and through which Works a shaft h, to the top of which is fastened the bevelgear G, a collarz' being first placed upon shaft h to receive the hub of the gear. On the lower end of shaft h is fastened the usual bit or auger holder piece I-I with its set-screw j.' Motion is imparted to gear G and its shaft 7L by means of bevel-gear I on the cross-shaft J, which turns in bearings 7o k in frame F, and which bearings areformed by boring holes through the enlargements la 7c, and then passing shaft .I through them before its handles K K are both put on. By this mode of constructing frame F no bolts or screws are required in forming the bearings for shaft J. To elevate the frame F after the hole has been bored to the proper depth without removing the hands from the handles K, a spur-gear L is placed on the center of shaft J and made fast thereto.

A rack-piece M is hinged at its lower end to a projection Z on the left lower side of the frame, as indicated in the drawings. The top of this rack-piece is made quite narrow and plays back and fort-h in a slot in the lower side of a tubular projection m on the under side of the cap-piece N, screwed to the top of frame D. Before the top or cap piece N is put on a spiral spring n (shown in dotted lines, Fig. 3) is passed into the hole in the cap-piece from the rear. Then as the cappiece is put on the spring n is forced or compressed somewhat into the hole, so that when the cap-piece is well in place the rear of the spring will press against the inner side of the top of frame D, while the front end will press against that point of the top or upper end of the rack-piece M which passes up into the tubular projection m, whereby there is a constant tendency of the spring 'n to force or swing the top of the rack-piece forward and keep it close up against the end of the slot in projection m, as indicated in black lines,`Fig. 3. Two guide-pieces o 0 are cast on the right side of rack-piece M, and through which passes a regulating-rod O, provided at the bottom with a stop-piece fp, having a set-screw q. by which to fasten the stop-piece to the rod at any desired elevation.

At the top of regulating-rod O is fastened a slotted catch head-piece s, a spiral spring t being placed on rod O, so as to rest on the top of the upper guide-piece 0, while the top of the spring presses up against the under side of the catch-piece s, tokeep it up against the stationary latch u, cast on the lower side of the cap or head piece N.

From the lower cross-piece of the gearframe F projects inwardly a rigid'dogP to act upon an outwardly-projecting dog e on stoppiece p.

The operation is as follows: Frame F being inthe position shown in blaclrlines, Figs. 2 and 3, its dog P rests on dog o, whereby rod O is depressed so as to drawdown the slotted catch-piece s from the catch w on the latch u, thus permitting the spiral springn to force the top of the rack-piece M forward, whereby its cogs or teeth are caused to take into the teeth or cogs on wheel or gear L, when by turningthe handles K K in the direction of arrow 2 frame F and its gear are elevated by means of the teeth on gear L working into those of. rack M. As gear L runs up rack M it comes in` contact when near the top with the curved part y of 'rack M, and consequently forces the upper end of said rack back, together with rod O piece gets back of catch w on latch u, when spring t lifts rod O, so as to bring catchpiece s up behind the catch w, as shown in `so as to extend around the anges d d of "frame D.to reduce friction and. aiford suffiycient space for the free operation of the rack and gearing, substantially as described.

red lines, Fig. 3. By now continuing to turn gear L so as to elevate it a little higher than it is shown in red lines, Fig. 3, its center will be above the last cog or tooth on rack M, and

will be clasped by the backward curved uncogged part z of the rack-piece M, where it will be held. from descending together with frame F and the parts connected therewith,

even though the hands of the operator be ref ,D and rack-piece M, of the cap-piece N and its slotted tubular projection m and its spring WL, as and for the purposes set forth.

moved from the handles K K. Frame D is now adjusted to give the boring-tool thel desired inclination, when the operator takes hold of the handles K K and gives them a :with rack-piecel M, frame F, and the parts i connected therewith, substantially as and for 'the purposes set forth.

slight movement in the direction of arrows 3, which causes gear L to run down below the curved cogged part of rack M, whereby gear L and rack M are thrown out of contact, (the rack-piece M being held back by the slotted catch-piece s coming in contact with catch w on latch 16,) and frame F, with its boring-tool, 5 is now free to descend byits own gravity. As soon as gear L is out of contact with rack M i ,found well developedy in my machine. construction isV such that but few bolts are necessary, while thel strength of frame D is 4 very great. 1 anges d d, whenby application of cap-piece N it is prevented from getting off, the cappiece at the same time answering for a sup- ;port and guide to the upper end of the rackpiece M, adjusting-rod O, spring a, and also ias a circular brace to the upper end of :frame D.

and its slotted catch-piece s, until catoh- Ling-machine, what I claim as my invention, and desire to secure by Letters Patent, is-

the operator turns the handles in the direction of arrows 2 and continues the operation until the hole has been bored of the proper depth,

when dogP on Aframe F strikes against doge on stop-piece p, fastened to rod O, whereby the latter is depressed, thus releasing the slotted .catch-piece s from catch w, when spring n boring-tool are quickly elevated into the highest position, above described, and thus the operation can be repeated as long as desired.

In a machine of this kind its greaty merit must necessarily consist to a considerable degrec in the simplicity of construction and durability combined of an arrangement for automatic operation, and which features are The Frame F is slid down over the Having thus described my improved borl. Constructing frameF in curved form and 2. The combination of the curved hinged y rack-piece M and gear L with frames D and -F, substantially as and for the purposes set ,'forth.

3. The combination, with the top of frame 4. The combination of the adjusting-rod O In witness whereof I have hereunto sub- ?scribed my name.

JOSEPH EDGECOMB. In presence of JAMES H. BANCROFT, SAMUEL MORSE. 

